<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="../lib/jquery-3.4.1.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0
        }

        .small-icons img {
            width: 116px;
        }

        .current {
            border: 1px solid red;
        }
    </style>
</head>

<body>
    <div class="small-icons">
        <img src="images/01.png" alt="" class="current">
        <img src="images/02.png" alt="">
        <img src="images/03.png" alt="">
        <img src="images/04.png" alt="">
        <img src="images/05.png" alt="">


    </div>
    <div class="content">
        <img src="images/01.png" alt="" class="current">
        <script>
            // siblings()获取兄弟元素
            // index() 获取元素的下标值
            $(".small-icons img").click(function(){
                // console.log($(this).siblings())
                $(this).addClass("current").siblings().removeClass("current")
                var index=$(this).index();
                $(".content>img").attr("src",`images/0${index+1}.png`)
            })
        </script>
    </div>
</body>

</html>